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Finding the Fourth Proportional to 426,447.43, 639,457.22 and 142,038.01

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Solution

The fourth proportional to 426,447.43, 639,457.22 and 142,038.01 is: 212,985.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,447.43 : 639,457.22 = 142,038.01 : x
  2. Step 2: Convert to fraction form
    426,447.43/639,457.22 = 142,038.01/x
  3. Step 3: Cross multiply
    426,447.43x = 639,457.22 × 142,038.01
  4. Step 4: Simplify right side
    426,447.43x = 90,827,227,767.44
  5. Step 5: Solve for x
    x = 90,827,227,767.44/426,447.43
  6. Step 6: Final answer
    x = 212,985.75

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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.