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Finding the Fourth Proportional to 318,209.58, 438,689.93 and 253,897.20

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Solution

The fourth proportional to 318,209.58, 438,689.93 and 253,897.20 is: 350,027.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,209.58 : 438,689.93 = 253,897.20 : x
  2. Step 2: Convert to fraction form
    318,209.58/438,689.93 = 253,897.20/x
  3. Step 3: Cross multiply
    318,209.58x = 438,689.93 × 253,897.20
  4. Step 4: Simplify right side
    318,209.58x = 111,382,143,625.71
  5. Step 5: Solve for x
    x = 111,382,143,625.71/318,209.58
  6. Step 6: Final answer
    x = 350,027.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.