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Finding the Fourth Proportional to 528,009.12, 728,358.48 and 312,942.24

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Solution

The fourth proportional to 528,009.12, 728,358.48 and 312,942.24 is: 431,685.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,009.12 : 728,358.48 = 312,942.24 : x
  2. Step 2: Convert to fraction form
    528,009.12/728,358.48 = 312,942.24/x
  3. Step 3: Cross multiply
    528,009.12x = 728,358.48 × 312,942.24
  4. Step 4: Simplify right side
    528,009.12x = 227,934,134,254.20
  5. Step 5: Solve for x
    x = 227,934,134,254.20/528,009.12
  6. Step 6: Final answer
    x = 431,685.98

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.