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Finding the Fourth Proportional to 487,113.80, 728,702.40 and 421,285.10

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Solution

The fourth proportional to 487,113.80, 728,702.40 and 421,285.10 is: 630,225.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,113.80 : 728,702.40 = 421,285.10 : x
  2. Step 2: Convert to fraction form
    487,113.80/728,702.40 = 421,285.10/x
  3. Step 3: Cross multiply
    487,113.80x = 728,702.40 × 421,285.10
  4. Step 4: Simplify right side
    487,113.80x = 306,991,463,454.24
  5. Step 5: Solve for x
    x = 306,991,463,454.24/487,113.80
  6. Step 6: Final answer
    x = 630,225.35

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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.