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Finding the Fourth Proportional to 138,999.60, 208,450.80 and 72,417.60

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Solution

The fourth proportional to 138,999.60, 208,450.80 and 72,417.60 is: 108,601.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,999.60 : 208,450.80 = 72,417.60 : x
  2. Step 2: Convert to fraction form
    138,999.60/208,450.80 = 72,417.60/x
  3. Step 3: Cross multiply
    138,999.60x = 208,450.80 × 72,417.60
  4. Step 4: Simplify right side
    138,999.60x = 15,095,506,654.08
  5. Step 5: Solve for x
    x = 15,095,506,654.08/138,999.60
  6. Step 6: Final answer
    x = 108,601.08

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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.