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Finding the Fourth Proportional to 1,007.63, 1,390.20 and 565.45

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Solution

The fourth proportional to 1,007.63, 1,390.20 and 565.45 is: 780.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.63 : 1,390.20 = 565.45 : x
  2. Step 2: Convert to fraction form
    1,007.63/1,390.20 = 565.45/x
  3. Step 3: Cross multiply
    1,007.63x = 1,390.20 × 565.45
  4. Step 4: Simplify right side
    1,007.63x = 786,082.99
  5. Step 5: Solve for x
    x = 786,082.99/1,007.63
  6. Step 6: Final answer
    x = 780.13

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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.