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Finding the Fourth Proportional to 508,718.80, 763,078.20 and 390,984.40

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Solution

The fourth proportional to 508,718.80, 763,078.20 and 390,984.40 is: 586,476.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    508,718.80 : 763,078.20 = 390,984.40 : x
  2. Step 2: Convert to fraction form
    508,718.80/763,078.20 = 390,984.40/x
  3. Step 3: Cross multiply
    508,718.80x = 763,078.20 × 390,984.40
  4. Step 4: Simplify right side
    508,718.80x = 298,351,672,180.08
  5. Step 5: Solve for x
    x = 298,351,672,180.08/508,718.80
  6. Step 6: Final answer
    x = 586,476.60

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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.