Home / 81,139.18-121,412.73-47,875.18

Finding the Fourth Proportional to 81,139.18, 121,412.73 and 47,875.18

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Solution

The fourth proportional to 81,139.18, 121,412.73 and 47,875.18 is: 71,638.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,139.18 : 121,412.73 = 47,875.18 : x
  2. Step 2: Convert to fraction form
    81,139.18/121,412.73 = 47,875.18/x
  3. Step 3: Cross multiply
    81,139.18x = 121,412.73 × 47,875.18
  4. Step 4: Simplify right side
    81,139.18x = 5,812,656,303.04
  5. Step 5: Solve for x
    x = 5,812,656,303.04/81,139.18
  6. Step 6: Final answer
    x = 71,638.10

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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.