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Finding the Fourth Proportional to 708,009.49, 976,606.72 and 421,315.57

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Solution

The fourth proportional to 708,009.49, 976,606.72 and 421,315.57 is: 581,149.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,009.49 : 976,606.72 = 421,315.57 : x
  2. Step 2: Convert to fraction form
    708,009.49/976,606.72 = 421,315.57/x
  3. Step 3: Cross multiply
    708,009.49x = 976,606.72 × 421,315.57
  4. Step 4: Simplify right side
    708,009.49x = 411,459,616,902.63
  5. Step 5: Solve for x
    x = 411,459,616,902.63/708,009.49
  6. Step 6: Final answer
    x = 581,149.86

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1.5x scale

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.