Home / 81,307.02-121,890.45-31,422.12

Finding the Fourth Proportional to 81,307.02, 121,890.45 and 31,422.12

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Solution

The fourth proportional to 81,307.02, 121,890.45 and 31,422.12 is: 47,106.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,307.02 : 121,890.45 = 31,422.12 : x
  2. Step 2: Convert to fraction form
    81,307.02/121,890.45 = 31,422.12/x
  3. Step 3: Cross multiply
    81,307.02x = 121,890.45 × 31,422.12
  4. Step 4: Simplify right side
    81,307.02x = 3,830,056,346.75
  5. Step 5: Solve for x
    x = 3,830,056,346.75/81,307.02
  6. Step 6: Final answer
    x = 47,106.10

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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.