Home / 85,768.34-128,678.98-38,423.30

Finding the Fourth Proportional to 85,768.34, 128,678.98 and 38,423.30

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Solution

The fourth proportional to 85,768.34, 128,678.98 and 38,423.30 is: 57,646.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,768.34 : 128,678.98 = 38,423.30 : x
  2. Step 2: Convert to fraction form
    85,768.34/128,678.98 = 38,423.30/x
  3. Step 3: Cross multiply
    85,768.34x = 128,678.98 × 38,423.30
  4. Step 4: Simplify right side
    85,768.34x = 4,944,271,052.23
  5. Step 5: Solve for x
    x = 4,944,271,052.23/85,768.34
  6. Step 6: Final answer
    x = 57,646.81

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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.