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Finding the Fourth Proportional to 287,438.34, 396,639.18 and 160,111.20

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Solution

The fourth proportional to 287,438.34, 396,639.18 and 160,111.20 is: 220,939.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,438.34 : 396,639.18 = 160,111.20 : x
  2. Step 2: Convert to fraction form
    287,438.34/396,639.18 = 160,111.20/x
  3. Step 3: Cross multiply
    287,438.34x = 396,639.18 × 160,111.20
  4. Step 4: Simplify right side
    287,438.34x = 63,506,375,076.82
  5. Step 5: Solve for x
    x = 63,506,375,076.82/287,438.34
  6. Step 6: Final answer
    x = 220,939.12

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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.