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Finding the Fourth Proportional to 261,037.60, 391,556.40 and 257,538.40

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Solution

The fourth proportional to 261,037.60, 391,556.40 and 257,538.40 is: 386,307.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,037.60 : 391,556.40 = 257,538.40 : x
  2. Step 2: Convert to fraction form
    261,037.60/391,556.40 = 257,538.40/x
  3. Step 3: Cross multiply
    261,037.60x = 391,556.40 × 257,538.40
  4. Step 4: Simplify right side
    261,037.60x = 100,840,808,765.76
  5. Step 5: Solve for x
    x = 100,840,808,765.76/261,037.60
  6. Step 6: Final answer
    x = 386,307.60

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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.