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Finding the Fourth Proportional to 85,417.15, 128,180.40 and 49,878.40

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Solution

The fourth proportional to 85,417.15, 128,180.40 and 49,878.40 is: 74,849.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,417.15 : 128,180.40 = 49,878.40 : x
  2. Step 2: Convert to fraction form
    85,417.15/128,180.40 = 49,878.40/x
  3. Step 3: Cross multiply
    85,417.15x = 128,180.40 × 49,878.40
  4. Step 4: Simplify right side
    85,417.15x = 6,393,433,263.36
  5. Step 5: Solve for x
    x = 6,393,433,263.36/85,417.15
  6. Step 6: Final answer
    x = 74,849.53

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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.