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Finding the Fourth Proportional to 810.69, 1,118.96 and 479.36

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Solution

The fourth proportional to 810.69, 1,118.96 and 479.36 is: 661.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.69 : 1,118.96 = 479.36 : x
  2. Step 2: Convert to fraction form
    810.69/1,118.96 = 479.36/x
  3. Step 3: Cross multiply
    810.69x = 1,118.96 × 479.36
  4. Step 4: Simplify right side
    810.69x = 536,376.67
  5. Step 5: Solve for x
    x = 536,376.67/810.69
  6. Step 6: Final answer
    x = 661.63

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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.