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Finding the Fourth Proportional to 28,362.40, 42,545.20 and 8,641.60

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Solution

The fourth proportional to 28,362.40, 42,545.20 and 8,641.60 is: 12,962.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,362.40 : 42,545.20 = 8,641.60 : x
  2. Step 2: Convert to fraction form
    28,362.40/42,545.20 = 8,641.60/x
  3. Step 3: Cross multiply
    28,362.40x = 42,545.20 × 8,641.60
  4. Step 4: Simplify right side
    28,362.40x = 367,658,600.32
  5. Step 5: Solve for x
    x = 367,658,600.32/28,362.40
  6. Step 6: Final answer
    x = 12,962.89

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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.