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Finding the Fourth Proportional to 691.09, 1,036.46 and 471.68

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Solution

The fourth proportional to 691.09, 1,036.46 and 471.68 is: 707.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.09 : 1,036.46 = 471.68 : x
  2. Step 2: Convert to fraction form
    691.09/1,036.46 = 471.68/x
  3. Step 3: Cross multiply
    691.09x = 1,036.46 × 471.68
  4. Step 4: Simplify right side
    691.09x = 488,877.07
  5. Step 5: Solve for x
    x = 488,877.07/691.09
  6. Step 6: Final answer
    x = 707.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.