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Finding the Fourth Proportional to 1,007.36, 1,390.23 and 565.29

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Solution

The fourth proportional to 1,007.36, 1,390.23 and 565.29 is: 780.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.36 : 1,390.23 = 565.29 : x
  2. Step 2: Convert to fraction form
    1,007.36/1,390.23 = 565.29/x
  3. Step 3: Cross multiply
    1,007.36x = 1,390.23 × 565.29
  4. Step 4: Simplify right side
    1,007.36x = 785,876.17
  5. Step 5: Solve for x
    x = 785,876.17/1,007.36
  6. Step 6: Final answer
    x = 780.14

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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.