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Finding the Fourth Proportional to 85,383.30, 128,111.40 and 40,987.20

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Solution

The fourth proportional to 85,383.30, 128,111.40 and 40,987.20 is: 61,498.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,383.30 : 128,111.40 = 40,987.20 : x
  2. Step 2: Convert to fraction form
    85,383.30/128,111.40 = 40,987.20/x
  3. Step 3: Cross multiply
    85,383.30x = 128,111.40 × 40,987.20
  4. Step 4: Simplify right side
    85,383.30x = 5,250,927,574.08
  5. Step 5: Solve for x
    x = 5,250,927,574.08/85,383.30
  6. Step 6: Final answer
    x = 61,498.30

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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.