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Finding the Fourth Proportional to 674,128.88, 930,056.12 and 398,428.86

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Solution

The fourth proportional to 674,128.88, 930,056.12 and 398,428.86 is: 549,688.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    674,128.88 : 930,056.12 = 398,428.86 : x
  2. Step 2: Convert to fraction form
    674,128.88/930,056.12 = 398,428.86/x
  3. Step 3: Cross multiply
    674,128.88x = 930,056.12 × 398,428.86
  4. Step 4: Simplify right side
    674,128.88x = 370,561,197,635.48
  5. Step 5: Solve for x
    x = 370,561,197,635.48/674,128.88
  6. Step 6: Final answer
    x = 549,688.96

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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.