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Finding the Fourth Proportional to 765.69, 1,056.84 and 471.21

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Solution

The fourth proportional to 765.69, 1,056.84 and 471.21 is: 650.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.69 : 1,056.84 = 471.21 : x
  2. Step 2: Convert to fraction form
    765.69/1,056.84 = 471.21/x
  3. Step 3: Cross multiply
    765.69x = 1,056.84 × 471.21
  4. Step 4: Simplify right side
    765.69x = 497,993.58
  5. Step 5: Solve for x
    x = 497,993.58/765.69
  6. Step 6: Final answer
    x = 650.39

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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.