Home / 121,929.10-168,206.02-78,922.40

Finding the Fourth Proportional to 121,929.10, 168,206.02 and 78,922.40

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Solution

The fourth proportional to 121,929.10, 168,206.02 and 78,922.40 is: 108,876.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,929.10 : 168,206.02 = 78,922.40 : x
  2. Step 2: Convert to fraction form
    121,929.10/168,206.02 = 78,922.40/x
  3. Step 3: Cross multiply
    121,929.10x = 168,206.02 × 78,922.40
  4. Step 4: Simplify right side
    121,929.10x = 13,275,222,700.67
  5. Step 5: Solve for x
    x = 13,275,222,700.67/121,929.10
  6. Step 6: Final answer
    x = 108,876.58

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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.