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Finding the Fourth Proportional to 929.38, 1,387.88 and 875.38

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Solution

The fourth proportional to 929.38, 1,387.88 and 875.38 is: 1,307.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.38 : 1,387.88 = 875.38 : x
  2. Step 2: Convert to fraction form
    929.38/1,387.88 = 875.38/x
  3. Step 3: Cross multiply
    929.38x = 1,387.88 × 875.38
  4. Step 4: Simplify right side
    929.38x = 1,214,922.39
  5. Step 5: Solve for x
    x = 1,214,922.39/929.38
  6. Step 6: Final answer
    x = 1,307.24

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.