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Finding the Fourth Proportional to 928.96, 1,280.57 and 707.52

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Solution

The fourth proportional to 928.96, 1,280.57 and 707.52 is: 975.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.96 : 1,280.57 = 707.52 : x
  2. Step 2: Convert to fraction form
    928.96/1,280.57 = 707.52/x
  3. Step 3: Cross multiply
    928.96x = 1,280.57 × 707.52
  4. Step 4: Simplify right side
    928.96x = 906,028.89
  5. Step 5: Solve for x
    x = 906,028.89/928.96
  6. Step 6: Final answer
    x = 975.32

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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.