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Finding the Fourth Proportional to 647,967.84, 893,890.80 and 421,530.72

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Solution

The fourth proportional to 647,967.84, 893,890.80 and 421,530.72 is: 581,514.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,967.84 : 893,890.80 = 421,530.72 : x
  2. Step 2: Convert to fraction form
    647,967.84/893,890.80 = 421,530.72/x
  3. Step 3: Cross multiply
    647,967.84x = 893,890.80 × 421,530.72
  4. Step 4: Simplify right side
    647,967.84x = 376,802,432,525.38
  5. Step 5: Solve for x
    x = 376,802,432,525.38/647,967.84
  6. Step 6: Final answer
    x = 581,514.10

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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.