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Finding the Fourth Proportional to 103,637.60, 155,456.40 and 71,980.78

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Solution

The fourth proportional to 103,637.60, 155,456.40 and 71,980.78 is: 107,971.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,637.60 : 155,456.40 = 71,980.78 : x
  2. Step 2: Convert to fraction form
    103,637.60/155,456.40 = 71,980.78/x
  3. Step 3: Cross multiply
    103,637.60x = 155,456.40 × 71,980.78
  4. Step 4: Simplify right side
    103,637.60x = 11,189,872,927.99
  5. Step 5: Solve for x
    x = 11,189,872,927.99/103,637.60
  6. Step 6: Final answer
    x = 107,971.17

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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.