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Finding the Fourth Proportional to 136,985.80, 205,478.70 and 74,000.20

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Solution

The fourth proportional to 136,985.80, 205,478.70 and 74,000.20 is: 111,000.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,985.80 : 205,478.70 = 74,000.20 : x
  2. Step 2: Convert to fraction form
    136,985.80/205,478.70 = 74,000.20/x
  3. Step 3: Cross multiply
    136,985.80x = 205,478.70 × 74,000.20
  4. Step 4: Simplify right side
    136,985.80x = 15,205,464,895.74
  5. Step 5: Solve for x
    x = 15,205,464,895.74/136,985.80
  6. Step 6: Final answer
    x = 111,000.30

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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.