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Finding the Fourth Proportional to 389,330.70, 583,996.05 and 105,020.70

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Solution

The fourth proportional to 389,330.70, 583,996.05 and 105,020.70 is: 157,531.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,330.70 : 583,996.05 = 105,020.70 : x
  2. Step 2: Convert to fraction form
    389,330.70/583,996.05 = 105,020.70/x
  3. Step 3: Cross multiply
    389,330.70x = 583,996.05 × 105,020.70
  4. Step 4: Simplify right side
    389,330.70x = 61,331,673,968.24
  5. Step 5: Solve for x
    x = 61,331,673,968.24/389,330.70
  6. Step 6: Final answer
    x = 157,531.05

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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.