Home / 129,280.80-178,407.60-72,692.16

Finding the Fourth Proportional to 129,280.80, 178,407.60 and 72,692.16

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Solution

The fourth proportional to 129,280.80, 178,407.60 and 72,692.16 is: 100,315.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,280.80 : 178,407.60 = 72,692.16 : x
  2. Step 2: Convert to fraction form
    129,280.80/178,407.60 = 72,692.16/x
  3. Step 3: Cross multiply
    129,280.80x = 178,407.60 × 72,692.16
  4. Step 4: Simplify right side
    129,280.80x = 12,968,833,804.42
  5. Step 5: Solve for x
    x = 12,968,833,804.42/129,280.80
  6. Step 6: Final answer
    x = 100,315.23

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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.