Home / 191,985.30-287,977.95-128,999.70

Finding the Fourth Proportional to 191,985.30, 287,977.95 and 128,999.70

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Solution

The fourth proportional to 191,985.30, 287,977.95 and 128,999.70 is: 193,499.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,985.30 : 287,977.95 = 128,999.70 : x
  2. Step 2: Convert to fraction form
    191,985.30/287,977.95 = 128,999.70/x
  3. Step 3: Cross multiply
    191,985.30x = 287,977.95 × 128,999.70
  4. Step 4: Simplify right side
    191,985.30x = 37,149,069,156.62
  5. Step 5: Solve for x
    x = 37,149,069,156.62/191,985.30
  6. Step 6: Final answer
    x = 193,499.55

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Similar ratio
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1.5x scale

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.