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Finding the Fourth Proportional to 1,139.60, 1,572.12 and 720.48

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Solution

The fourth proportional to 1,139.60, 1,572.12 and 720.48 is: 993.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.60 : 1,572.12 = 720.48 : x
  2. Step 2: Convert to fraction form
    1,139.60/1,572.12 = 720.48/x
  3. Step 3: Cross multiply
    1,139.60x = 1,572.12 × 720.48
  4. Step 4: Simplify right side
    1,139.60x = 1,132,681.02
  5. Step 5: Solve for x
    x = 1,132,681.02/1,139.60
  6. Step 6: Final answer
    x = 993.93

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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.