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Finding the Fourth Proportional to 487,119.30, 728,710.65 and 421,290.60

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Solution

The fourth proportional to 487,119.30, 728,710.65 and 421,290.60 is: 630,233.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,119.30 : 728,710.65 = 421,290.60 : x
  2. Step 2: Convert to fraction form
    487,119.30/728,710.65 = 421,290.60/x
  3. Step 3: Cross multiply
    487,119.30x = 728,710.65 × 421,290.60
  4. Step 4: Simplify right side
    487,119.30x = 306,998,946,964.89
  5. Step 5: Solve for x
    x = 306,998,946,964.89/487,119.30
  6. Step 6: Final answer
    x = 630,233.59

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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.