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Finding the Fourth Proportional to 148,988.32, 205,603.88 and 81,920.32

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Solution

The fourth proportional to 148,988.32, 205,603.88 and 81,920.32 is: 113,050.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    148,988.32 : 205,603.88 = 81,920.32 : x
  2. Step 2: Convert to fraction form
    148,988.32/205,603.88 = 81,920.32/x
  3. Step 3: Cross multiply
    148,988.32x = 205,603.88 × 81,920.32
  4. Step 4: Simplify right side
    148,988.32x = 16,843,135,642.84
  5. Step 5: Solve for x
    x = 16,843,135,642.84/148,988.32
  6. Step 6: Final answer
    x = 113,050.04

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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.