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Finding the Fourth Proportional to 612,421.28, 918,649.20 and 169,189.28

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Solution

The fourth proportional to 612,421.28, 918,649.20 and 169,189.28 is: 253,788.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,421.28 : 918,649.20 = 169,189.28 : x
  2. Step 2: Convert to fraction form
    612,421.28/918,649.20 = 169,189.28/x
  3. Step 3: Cross multiply
    612,421.28x = 918,649.20 × 169,189.28
  4. Step 4: Simplify right side
    612,421.28x = 155,425,596,720.58
  5. Step 5: Solve for x
    x = 155,425,596,720.58/612,421.28
  6. Step 6: Final answer
    x = 253,788.69

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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.