Home / 78,720.48-109,386.36-77,726.88

Finding the Fourth Proportional to 78,720.48, 109,386.36 and 77,726.88

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Solution

The fourth proportional to 78,720.48, 109,386.36 and 77,726.88 is: 108,005.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,720.48 : 109,386.36 = 77,726.88 : x
  2. Step 2: Convert to fraction form
    78,720.48/109,386.36 = 77,726.88/x
  3. Step 3: Cross multiply
    78,720.48x = 109,386.36 × 77,726.88
  4. Step 4: Simplify right side
    78,720.48x = 8,502,260,477.36
  5. Step 5: Solve for x
    x = 8,502,260,477.36/78,720.48
  6. Step 6: Final answer
    x = 108,005.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.