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Finding the Fourth Proportional to 1,424.60, 1,966.88 and 921.32

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Solution

The fourth proportional to 1,424.60, 1,966.88 and 921.32 is: 1,272.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,424.60 : 1,966.88 = 921.32 : x
  2. Step 2: Convert to fraction form
    1,424.60/1,966.88 = 921.32/x
  3. Step 3: Cross multiply
    1,424.60x = 1,966.88 × 921.32
  4. Step 4: Simplify right side
    1,424.60x = 1,812,125.88
  5. Step 5: Solve for x
    x = 1,812,125.88/1,424.60
  6. Step 6: Final answer
    x = 1,272.02

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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.