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Finding the Fourth Proportional to 390,931.20, 587,271.60 and 374,990.40

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Solution

The fourth proportional to 390,931.20, 587,271.60 and 374,990.40 is: 563,324.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,931.20 : 587,271.60 = 374,990.40 : x
  2. Step 2: Convert to fraction form
    390,931.20/587,271.60 = 374,990.40/x
  3. Step 3: Cross multiply
    390,931.20x = 587,271.60 × 374,990.40
  4. Step 4: Simplify right side
    390,931.20x = 220,221,212,192.64
  5. Step 5: Solve for x
    x = 220,221,212,192.64/390,931.20
  6. Step 6: Final answer
    x = 563,324.73

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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.