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Finding the Fourth Proportional to 815,643.20, 1,223,902.20 and 342,376.40

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Solution

The fourth proportional to 815,643.20, 1,223,902.20 and 342,376.40 is: 513,748.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    815,643.20 : 1,223,902.20 = 342,376.40 : x
  2. Step 2: Convert to fraction form
    815,643.20/1,223,902.20 = 342,376.40/x
  3. Step 3: Cross multiply
    815,643.20x = 1,223,902.20 × 342,376.40
  4. Step 4: Simplify right side
    815,643.20x = 419,035,229,188.08
  5. Step 5: Solve for x
    x = 419,035,229,188.08/815,643.20
  6. Step 6: Final answer
    x = 513,748.20

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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.