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Finding the Fourth Proportional to 611,488.29, 917,395.10 and 212,128.41

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Solution

The fourth proportional to 611,488.29, 917,395.10 and 212,128.41 is: 318,249.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,488.29 : 917,395.10 = 212,128.41 : x
  2. Step 2: Convert to fraction form
    611,488.29/917,395.10 = 212,128.41/x
  3. Step 3: Cross multiply
    611,488.29x = 917,395.10 × 212,128.41
  4. Step 4: Simplify right side
    611,488.29x = 194,605,563,904.79
  5. Step 5: Solve for x
    x = 194,605,563,904.79/611,488.29
  6. Step 6: Final answer
    x = 318,249.04

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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.