Home / 138,880.47-191,666.85-78,462.21

Finding the Fourth Proportional to 138,880.47, 191,666.85 and 78,462.21

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Solution

The fourth proportional to 138,880.47, 191,666.85 and 78,462.21 is: 108,284.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,880.47 : 191,666.85 = 78,462.21 : x
  2. Step 2: Convert to fraction form
    138,880.47/191,666.85 = 78,462.21/x
  3. Step 3: Cross multiply
    138,880.47x = 191,666.85 × 78,462.21
  4. Step 4: Simplify right side
    138,880.47x = 15,038,604,634.74
  5. Step 5: Solve for x
    x = 15,038,604,634.74/138,880.47
  6. Step 6: Final answer
    x = 108,284.52

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1.5x scale

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.