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Finding the Fourth Proportional to 647,679.71, 893,492.96 and 421,242.59

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Solution

The fourth proportional to 647,679.71, 893,492.96 and 421,242.59 is: 581,116.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,679.71 : 893,492.96 = 421,242.59 : x
  2. Step 2: Convert to fraction form
    647,679.71/893,492.96 = 421,242.59/x
  3. Step 3: Cross multiply
    647,679.71x = 893,492.96 × 421,242.59
  4. Step 4: Simplify right side
    647,679.71x = 376,377,286,510.95
  5. Step 5: Solve for x
    x = 376,377,286,510.95/647,679.71
  6. Step 6: Final answer
    x = 581,116.38

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.