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Finding the Fourth Proportional to 285,644.40, 428,526.52 and 85,979.40

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Solution

The fourth proportional to 285,644.40, 428,526.52 and 85,979.40 is: 128,987.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,644.40 : 428,526.52 = 85,979.40 : x
  2. Step 2: Convert to fraction form
    285,644.40/428,526.52 = 85,979.40/x
  3. Step 3: Cross multiply
    285,644.40x = 428,526.52 × 85,979.40
  4. Step 4: Simplify right side
    285,644.40x = 36,844,453,073.69
  5. Step 5: Solve for x
    x = 36,844,453,073.69/285,644.40
  6. Step 6: Final answer
    x = 128,987.14

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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.