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Finding the Fourth Proportional to 85,965.44, 128,780.42 and 56,293.32

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Solution

The fourth proportional to 85,965.44, 128,780.42 and 56,293.32 is: 84,330.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,965.44 : 128,780.42 = 56,293.32 : x
  2. Step 2: Convert to fraction form
    85,965.44/128,780.42 = 56,293.32/x
  3. Step 3: Cross multiply
    85,965.44x = 128,780.42 × 56,293.32
  4. Step 4: Simplify right side
    85,965.44x = 7,249,477,392.79
  5. Step 5: Solve for x
    x = 7,249,477,392.79/85,965.44
  6. Step 6: Final answer
    x = 84,330.14

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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.