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Finding the Fourth Proportional to 672.40, 1,007.40 and 569.20

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Solution

The fourth proportional to 672.40, 1,007.40 and 569.20 is: 852.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.40 : 1,007.40 = 569.20 : x
  2. Step 2: Convert to fraction form
    672.40/1,007.40 = 569.20/x
  3. Step 3: Cross multiply
    672.40x = 1,007.40 × 569.20
  4. Step 4: Simplify right side
    672.40x = 573,412.08
  5. Step 5: Solve for x
    x = 573,412.08/672.40
  6. Step 6: Final answer
    x = 852.78

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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.