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Finding the Fourth Proportional to 315,774.20, 473,430.90 and 128,689.40

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Solution

The fourth proportional to 315,774.20, 473,430.90 and 128,689.40 is: 192,940.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,774.20 : 473,430.90 = 128,689.40 : x
  2. Step 2: Convert to fraction form
    315,774.20/473,430.90 = 128,689.40/x
  3. Step 3: Cross multiply
    315,774.20x = 473,430.90 × 128,689.40
  4. Step 4: Simplify right side
    315,774.20x = 60,925,538,462.46
  5. Step 5: Solve for x
    x = 60,925,538,462.46/315,774.20
  6. Step 6: Final answer
    x = 192,940.20

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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.