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Finding the Fourth Proportional to 615,289.40, 921,378.90 and 403,782.20

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Solution

The fourth proportional to 615,289.40, 921,378.90 and 403,782.20 is: 604,652.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,289.40 : 921,378.90 = 403,782.20 : x
  2. Step 2: Convert to fraction form
    615,289.40/921,378.90 = 403,782.20/x
  3. Step 3: Cross multiply
    615,289.40x = 921,378.90 × 403,782.20
  4. Step 4: Simplify right side
    615,289.40x = 372,036,399,275.58
  5. Step 5: Solve for x
    x = 372,036,399,275.58/615,289.40
  6. Step 6: Final answer
    x = 604,652.70

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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.