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Finding the Fourth Proportional to 426,603.20, 640,423.20 and 216,132.80

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Solution

The fourth proportional to 426,603.20, 640,423.20 and 216,132.80 is: 324,461.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,603.20 : 640,423.20 = 216,132.80 : x
  2. Step 2: Convert to fraction form
    426,603.20/640,423.20 = 216,132.80/x
  3. Step 3: Cross multiply
    426,603.20x = 640,423.20 × 216,132.80
  4. Step 4: Simplify right side
    426,603.20x = 138,416,459,400.96
  5. Step 5: Solve for x
    x = 138,416,459,400.96/426,603.20
  6. Step 6: Final answer
    x = 324,461.84

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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.