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Finding the Fourth Proportional to 347,428.30, 478,795.80 and 278,439.40

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Solution

The fourth proportional to 347,428.30, 478,795.80 and 278,439.40 is: 383,721.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    347,428.30 : 478,795.80 = 278,439.40 : x
  2. Step 2: Convert to fraction form
    347,428.30/478,795.80 = 278,439.40/x
  3. Step 3: Cross multiply
    347,428.30x = 478,795.80 × 278,439.40
  4. Step 4: Simplify right side
    347,428.30x = 133,315,615,274.52
  5. Step 5: Solve for x
    x = 133,315,615,274.52/347,428.30
  6. Step 6: Final answer
    x = 383,721.23

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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.