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Finding the Fourth Proportional to 85,357.48, 128,101.56 and 38,643.16

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Solution

The fourth proportional to 85,357.48, 128,101.56 and 38,643.16 is: 57,994.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,357.48 : 128,101.56 = 38,643.16 : x
  2. Step 2: Convert to fraction form
    85,357.48/128,101.56 = 38,643.16/x
  3. Step 3: Cross multiply
    85,357.48x = 128,101.56 × 38,643.16
  4. Step 4: Simplify right side
    85,357.48x = 4,950,249,079.33
  5. Step 5: Solve for x
    x = 4,950,249,079.33/85,357.48
  6. Step 6: Final answer
    x = 57,994.32

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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.