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Finding the Fourth Proportional to 912,820.60, 1,369,230.90 and 313,728.40

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Solution

The fourth proportional to 912,820.60, 1,369,230.90 and 313,728.40 is: 470,592.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    912,820.60 : 1,369,230.90 = 313,728.40 : x
  2. Step 2: Convert to fraction form
    912,820.60/1,369,230.90 = 313,728.40/x
  3. Step 3: Cross multiply
    912,820.60x = 1,369,230.90 × 313,728.40
  4. Step 4: Simplify right side
    912,820.60x = 429,566,619,487.56
  5. Step 5: Solve for x
    x = 429,566,619,487.56/912,820.60
  6. Step 6: Final answer
    x = 470,592.60

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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.