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Finding the Fourth Proportional to 3,118.76, 4,303.78 and 1,859.17

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Solution

The fourth proportional to 3,118.76, 4,303.78 and 1,859.17 is: 2,565.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,118.76 : 4,303.78 = 1,859.17 : x
  2. Step 2: Convert to fraction form
    3,118.76/4,303.78 = 1,859.17/x
  3. Step 3: Cross multiply
    3,118.76x = 4,303.78 × 1,859.17
  4. Step 4: Simplify right side
    3,118.76x = 8,001,437.14
  5. Step 5: Solve for x
    x = 8,001,437.14/3,118.76
  6. Step 6: Final answer
    x = 2,565.58

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Half scale
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Double scale
Find fourth proportional to 3,119.76, 4,305.16 and 1,860.17
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.