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Finding the Fourth Proportional to 145,861.40, 218,354.70 and 86,666.60

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Solution

The fourth proportional to 145,861.40, 218,354.70 and 86,666.60 is: 129,740.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,861.40 : 218,354.70 = 86,666.60 : x
  2. Step 2: Convert to fraction form
    145,861.40/218,354.70 = 86,666.60/x
  3. Step 3: Cross multiply
    145,861.40x = 218,354.70 × 86,666.60
  4. Step 4: Simplify right side
    145,861.40x = 18,924,059,443.02
  5. Step 5: Solve for x
    x = 18,924,059,443.02/145,861.40
  6. Step 6: Final answer
    x = 129,740.01

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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.