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Finding the Fourth Proportional to 319,616.40, 478,987.20 and 212,696.40

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Solution

The fourth proportional to 319,616.40, 478,987.20 and 212,696.40 is: 318,753.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,616.40 : 478,987.20 = 212,696.40 : x
  2. Step 2: Convert to fraction form
    319,616.40/478,987.20 = 212,696.40/x
  3. Step 3: Cross multiply
    319,616.40x = 478,987.20 × 212,696.40
  4. Step 4: Simplify right side
    319,616.40x = 101,878,853,086.08
  5. Step 5: Solve for x
    x = 101,878,853,086.08/319,616.40
  6. Step 6: Final answer
    x = 318,753.52

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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.