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Finding the Fourth Proportional to 925.90, 1,389.06 and 885.53

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Solution

The fourth proportional to 925.90, 1,389.06 and 885.53 is: 1,328.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.90 : 1,389.06 = 885.53 : x
  2. Step 2: Convert to fraction form
    925.90/1,389.06 = 885.53/x
  3. Step 3: Cross multiply
    925.90x = 1,389.06 × 885.53
  4. Step 4: Simplify right side
    925.90x = 1,230,057.77
  5. Step 5: Solve for x
    x = 1,230,057.77/925.90
  6. Step 6: Final answer
    x = 1,328.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.