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Finding the Fourth Proportional to 260,404.20, 390,606.30 and 257,639.40

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Solution

The fourth proportional to 260,404.20, 390,606.30 and 257,639.40 is: 386,459.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,404.20 : 390,606.30 = 257,639.40 : x
  2. Step 2: Convert to fraction form
    260,404.20/390,606.30 = 257,639.40/x
  3. Step 3: Cross multiply
    260,404.20x = 390,606.30 × 257,639.40
  4. Step 4: Simplify right side
    260,404.20x = 100,635,572,768.22
  5. Step 5: Solve for x
    x = 100,635,572,768.22/260,404.20
  6. Step 6: Final answer
    x = 386,459.10

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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.