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Finding the Fourth Proportional to 876,987, 1,315,480.50 and 212,139

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Solution

The fourth proportional to 876,987, 1,315,480.50 and 212,139 is: 318,208.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    876,987 : 1,315,480.50 = 212,139 : x
  2. Step 2: Convert to fraction form
    876,987/1,315,480.50 = 212,139/x
  3. Step 3: Cross multiply
    876,987x = 1,315,480.50 × 212,139
  4. Step 4: Simplify right side
    876,987x = 279,064,717,789.50
  5. Step 5: Solve for x
    x = 279,064,717,789.50/876,987
  6. Step 6: Final answer
    x = 318,208.50

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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.