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Finding the Fourth Proportional to 1,224.17, 1,687.43 and 928.92

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Solution

The fourth proportional to 1,224.17, 1,687.43 and 928.92 is: 1,280.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.17 : 1,687.43 = 928.92 : x
  2. Step 2: Convert to fraction form
    1,224.17/1,687.43 = 928.92/x
  3. Step 3: Cross multiply
    1,224.17x = 1,687.43 × 928.92
  4. Step 4: Simplify right side
    1,224.17x = 1,567,482.83
  5. Step 5: Solve for x
    x = 1,567,482.83/1,224.17
  6. Step 6: Final answer
    x = 1,280.45

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1.5x scale

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.