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Finding the Fourth Proportional to 389,628.05, 584,420.21 and 105,314.41

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Solution

The fourth proportional to 389,628.05, 584,420.21 and 105,314.41 is: 157,965.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,628.05 : 584,420.21 = 105,314.41 : x
  2. Step 2: Convert to fraction form
    389,628.05/584,420.21 = 105,314.41/x
  3. Step 3: Cross multiply
    389,628.05x = 584,420.21 × 105,314.41
  4. Step 4: Simplify right side
    389,628.05x = 61,547,866,159.55
  5. Step 5: Solve for x
    x = 61,547,866,159.55/389,628.05
  6. Step 6: Final answer
    x = 157,965.70

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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.