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Finding the Fourth Proportional to 103,620.60, 155,430.90 and 67,985.40

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Solution

The fourth proportional to 103,620.60, 155,430.90 and 67,985.40 is: 101,978.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,620.60 : 155,430.90 = 67,985.40 : x
  2. Step 2: Convert to fraction form
    103,620.60/155,430.90 = 67,985.40/x
  3. Step 3: Cross multiply
    103,620.60x = 155,430.90 × 67,985.40
  4. Step 4: Simplify right side
    103,620.60x = 10,567,031,908.86
  5. Step 5: Solve for x
    x = 10,567,031,908.86/103,620.60
  6. Step 6: Final answer
    x = 101,978.10

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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.