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Finding the Fourth Proportional to 663,554.73, 915,417.27 and 421,707.63

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Solution

The fourth proportional to 663,554.73, 915,417.27 and 421,707.63 is: 581,773.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,554.73 : 915,417.27 = 421,707.63 : x
  2. Step 2: Convert to fraction form
    663,554.73/915,417.27 = 421,707.63/x
  3. Step 3: Cross multiply
    663,554.73x = 915,417.27 × 421,707.63
  4. Step 4: Simplify right side
    663,554.73x = 386,038,447,392.77
  5. Step 5: Solve for x
    x = 386,038,447,392.77/663,554.73
  6. Step 6: Final answer
    x = 581,773.33

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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.