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Finding the Fourth Proportional to 438,726.10, 605,386.36 and 257,371.86

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Solution

The fourth proportional to 438,726.10, 605,386.36 and 257,371.86 is: 355,140.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,726.10 : 605,386.36 = 257,371.86 : x
  2. Step 2: Convert to fraction form
    438,726.10/605,386.36 = 257,371.86/x
  3. Step 3: Cross multiply
    438,726.10x = 605,386.36 × 257,371.86
  4. Step 4: Simplify right side
    438,726.10x = 155,809,413,491.83
  5. Step 5: Solve for x
    x = 155,809,413,491.83/438,726.10
  6. Step 6: Final answer
    x = 355,140.52

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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.