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Finding the Fourth Proportional to 257,005.60, 385,508.40 and 90,810.40

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Solution

The fourth proportional to 257,005.60, 385,508.40 and 90,810.40 is: 136,215.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,005.60 : 385,508.40 = 90,810.40 : x
  2. Step 2: Convert to fraction form
    257,005.60/385,508.40 = 90,810.40/x
  3. Step 3: Cross multiply
    257,005.60x = 385,508.40 × 90,810.40
  4. Step 4: Simplify right side
    257,005.60x = 35,008,172,007.36
  5. Step 5: Solve for x
    x = 35,008,172,007.36/257,005.60
  6. Step 6: Final answer
    x = 136,215.60

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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.