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Finding the Fourth Proportional to 608,348.72, 912,671.76 and 428,784.32

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Solution

The fourth proportional to 608,348.72, 912,671.76 and 428,784.32 is: 643,281.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    608,348.72 : 912,671.76 = 428,784.32 : x
  2. Step 2: Convert to fraction form
    608,348.72/912,671.76 = 428,784.32/x
  3. Step 3: Cross multiply
    608,348.72x = 912,671.76 × 428,784.32
  4. Step 4: Simplify right side
    608,348.72x = 391,339,339,994.80
  5. Step 5: Solve for x
    x = 391,339,339,994.80/608,348.72
  6. Step 6: Final answer
    x = 643,281.27

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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.