Home / 138,461.08-208,125.14-91,378.72

Finding the Fourth Proportional to 138,461.08, 208,125.14 and 91,378.72

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Solution

The fourth proportional to 138,461.08, 208,125.14 and 91,378.72 is: 137,354.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,461.08 : 208,125.14 = 91,378.72 : x
  2. Step 2: Convert to fraction form
    138,461.08/208,125.14 = 91,378.72/x
  3. Step 3: Cross multiply
    138,461.08x = 208,125.14 × 91,378.72
  4. Step 4: Simplify right side
    138,461.08x = 19,018,208,893.02
  5. Step 5: Solve for x
    x = 19,018,208,893.02/138,461.08
  6. Step 6: Final answer
    x = 137,354.19

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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.