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Finding the Fourth Proportional to 925.63, 1,276.56 and 631.30

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Solution

The fourth proportional to 925.63, 1,276.56 and 631.30 is: 870.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.63 : 1,276.56 = 631.30 : x
  2. Step 2: Convert to fraction form
    925.63/1,276.56 = 631.30/x
  3. Step 3: Cross multiply
    925.63x = 1,276.56 × 631.30
  4. Step 4: Simplify right side
    925.63x = 805,892.33
  5. Step 5: Solve for x
    x = 805,892.33/925.63
  6. Step 6: Final answer
    x = 870.64

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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.