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Finding the Fourth Proportional to 391,689.18, 587,533.78 and 258,538.30

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Solution

The fourth proportional to 391,689.18, 587,533.78 and 258,538.30 is: 387,807.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,689.18 : 587,533.78 = 258,538.30 : x
  2. Step 2: Convert to fraction form
    391,689.18/587,533.78 = 258,538.30/x
  3. Step 3: Cross multiply
    391,689.18x = 587,533.78 × 258,538.30
  4. Step 4: Simplify right side
    391,689.18x = 151,899,984,673.77
  5. Step 5: Solve for x
    x = 151,899,984,673.77/391,689.18
  6. Step 6: Final answer
    x = 387,807.46

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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.