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Finding the Fourth Proportional to 615,478.20, 922,698.90 and 319,990.20

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Solution

The fourth proportional to 615,478.20, 922,698.90 and 319,990.20 is: 479,715.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,478.20 : 922,698.90 = 319,990.20 : x
  2. Step 2: Convert to fraction form
    615,478.20/922,698.90 = 319,990.20/x
  3. Step 3: Cross multiply
    615,478.20x = 922,698.90 × 319,990.20
  4. Step 4: Simplify right side
    615,478.20x = 295,254,605,550.78
  5. Step 5: Solve for x
    x = 295,254,605,550.78/615,478.20
  6. Step 6: Final answer
    x = 479,715.78

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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.