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Finding the Fourth Proportional to 645,959.20, 969,514.80 and 379,386.40

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Solution

The fourth proportional to 645,959.20, 969,514.80 and 379,386.40 is: 569,417.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,959.20 : 969,514.80 = 379,386.40 : x
  2. Step 2: Convert to fraction form
    645,959.20/969,514.80 = 379,386.40/x
  3. Step 3: Cross multiply
    645,959.20x = 969,514.80 × 379,386.40
  4. Step 4: Simplify right side
    645,959.20x = 367,820,729,718.72
  5. Step 5: Solve for x
    x = 367,820,729,718.72/645,959.20
  6. Step 6: Final answer
    x = 569,417.90

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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.