Home / 81,071.40-121,607.10-56,139.60

Finding the Fourth Proportional to 81,071.40, 121,607.10 and 56,139.60

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Solution

The fourth proportional to 81,071.40, 121,607.10 and 56,139.60 is: 84,209.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,071.40 : 121,607.10 = 56,139.60 : x
  2. Step 2: Convert to fraction form
    81,071.40/121,607.10 = 56,139.60/x
  3. Step 3: Cross multiply
    81,071.40x = 121,607.10 × 56,139.60
  4. Step 4: Simplify right side
    81,071.40x = 6,826,973,951.16
  5. Step 5: Solve for x
    x = 6,826,973,951.16/81,071.40
  6. Step 6: Final answer
    x = 84,209.40

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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.