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Finding the Fourth Proportional to 487,990.95, 728,664.74 and 430,586.45

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Solution

The fourth proportional to 487,990.95, 728,664.74 and 430,586.45 is: 642,948.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,990.95 : 728,664.74 = 430,586.45 : x
  2. Step 2: Convert to fraction form
    487,990.95/728,664.74 = 430,586.45/x
  3. Step 3: Cross multiply
    487,990.95x = 728,664.74 × 430,586.45
  4. Step 4: Simplify right side
    487,990.95x = 313,753,164,609.76
  5. Step 5: Solve for x
    x = 313,753,164,609.76/487,990.95
  6. Step 6: Final answer
    x = 642,948.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.