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Finding the Fourth Proportional to 9,985.80, 14,978.70 and 9,912.90

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Solution

The fourth proportional to 9,985.80, 14,978.70 and 9,912.90 is: 14,869.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,985.80 : 14,978.70 = 9,912.90 : x
  2. Step 2: Convert to fraction form
    9,985.80/14,978.70 = 9,912.90/x
  3. Step 3: Cross multiply
    9,985.80x = 14,978.70 × 9,912.90
  4. Step 4: Simplify right side
    9,985.80x = 148,482,355.23
  5. Step 5: Solve for x
    x = 148,482,355.23/9,985.80
  6. Step 6: Final answer
    x = 14,869.35

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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.