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Finding the Fourth Proportional to 426,219.40, 639,005.10 and 216,008.20

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Solution

The fourth proportional to 426,219.40, 639,005.10 and 216,008.20 is: 323,848.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,219.40 : 639,005.10 = 216,008.20 : x
  2. Step 2: Convert to fraction form
    426,219.40/639,005.10 = 216,008.20/x
  3. Step 3: Cross multiply
    426,219.40x = 639,005.10 × 216,008.20
  4. Step 4: Simplify right side
    426,219.40x = 138,030,341,441.82
  5. Step 5: Solve for x
    x = 138,030,341,441.82/426,219.40
  6. Step 6: Final answer
    x = 323,848.10

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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.