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Finding the Fourth Proportional to 929.47, 1,288.22 and 912.19

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Solution

The fourth proportional to 929.47, 1,288.22 and 912.19 is: 1,264.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.47 : 1,288.22 = 912.19 : x
  2. Step 2: Convert to fraction form
    929.47/1,288.22 = 912.19/x
  3. Step 3: Cross multiply
    929.47x = 1,288.22 × 912.19
  4. Step 4: Simplify right side
    929.47x = 1,175,101.40
  5. Step 5: Solve for x
    x = 1,175,101.40/929.47
  6. Step 6: Final answer
    x = 1,264.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.