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Finding the Fourth Proportional to 1,007.40, 1,390.13 and 565.21

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Solution

The fourth proportional to 1,007.40, 1,390.13 and 565.21 is: 779.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.40 : 1,390.13 = 565.21 : x
  2. Step 2: Convert to fraction form
    1,007.40/1,390.13 = 565.21/x
  3. Step 3: Cross multiply
    1,007.40x = 1,390.13 × 565.21
  4. Step 4: Simplify right side
    1,007.40x = 785,715.38
  5. Step 5: Solve for x
    x = 785,715.38/1,007.40
  6. Step 6: Final answer
    x = 779.94

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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.