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Finding the Fourth Proportional to 98,666.60, 147,999.90 and 87,780.20

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Solution

The fourth proportional to 98,666.60, 147,999.90 and 87,780.20 is: 131,670.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,666.60 : 147,999.90 = 87,780.20 : x
  2. Step 2: Convert to fraction form
    98,666.60/147,999.90 = 87,780.20/x
  3. Step 3: Cross multiply
    98,666.60x = 147,999.90 × 87,780.20
  4. Step 4: Simplify right side
    98,666.60x = 12,991,460,821.98
  5. Step 5: Solve for x
    x = 12,991,460,821.98/98,666.60
  6. Step 6: Final answer
    x = 131,670.30

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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.