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Finding the Fourth Proportional to 929.48, 1,387.69 and 767.48

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Solution

The fourth proportional to 929.48, 1,387.69 and 767.48 is: 1,145.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.48 : 1,387.69 = 767.48 : x
  2. Step 2: Convert to fraction form
    929.48/1,387.69 = 767.48/x
  3. Step 3: Cross multiply
    929.48x = 1,387.69 × 767.48
  4. Step 4: Simplify right side
    929.48x = 1,065,024.32
  5. Step 5: Solve for x
    x = 1,065,024.32/929.48
  6. Step 6: Final answer
    x = 1,145.83

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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.