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Finding the Fourth Proportional to 810.77, 1,118.57 and 479.15

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Solution

The fourth proportional to 810.77, 1,118.57 and 479.15 is: 661.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.77 : 1,118.57 = 479.15 : x
  2. Step 2: Convert to fraction form
    810.77/1,118.57 = 479.15/x
  3. Step 3: Cross multiply
    810.77x = 1,118.57 × 479.15
  4. Step 4: Simplify right side
    810.77x = 535,954.83
  5. Step 5: Solve for x
    x = 535,954.83/810.77
  6. Step 6: Final answer
    x = 661.05

Related Problems

Find fourth proportional to 405.38, 559.28 and 239.57
Half scale
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Double scale
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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.