Home / 138,457.85-191,077.45-78,031.04

Finding the Fourth Proportional to 138,457.85, 191,077.45 and 78,031.04

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Solution

The fourth proportional to 138,457.85, 191,077.45 and 78,031.04 is: 107,686.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,457.85 : 191,077.45 = 78,031.04 : x
  2. Step 2: Convert to fraction form
    138,457.85/191,077.45 = 78,031.04/x
  3. Step 3: Cross multiply
    138,457.85x = 191,077.45 × 78,031.04
  4. Step 4: Simplify right side
    138,457.85x = 14,909,970,993.58
  5. Step 5: Solve for x
    x = 14,909,970,993.58/138,457.85
  6. Step 6: Final answer
    x = 107,686.00

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.