Home / 80,905.32-121,412.65-28,315.26

Finding the Fourth Proportional to 80,905.32, 121,412.65 and 28,315.26

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Solution

The fourth proportional to 80,905.32, 121,412.65 and 28,315.26 is: 42,492.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,905.32 : 121,412.65 = 28,315.26 : x
  2. Step 2: Convert to fraction form
    80,905.32/121,412.65 = 28,315.26/x
  3. Step 3: Cross multiply
    80,905.32x = 121,412.65 × 28,315.26
  4. Step 4: Simplify right side
    80,905.32x = 3,437,830,752.04
  5. Step 5: Solve for x
    x = 3,437,830,752.04/80,905.32
  6. Step 6: Final answer
    x = 42,492.02

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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.