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Finding the Fourth Proportional to 287,437.20, 431,155.80 and 109,852.80

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Solution

The fourth proportional to 287,437.20, 431,155.80 and 109,852.80 is: 164,779.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,437.20 : 431,155.80 = 109,852.80 : x
  2. Step 2: Convert to fraction form
    287,437.20/431,155.80 = 109,852.80/x
  3. Step 3: Cross multiply
    287,437.20x = 431,155.80 × 109,852.80
  4. Step 4: Simplify right side
    287,437.20x = 47,363,671,866.24
  5. Step 5: Solve for x
    x = 47,363,671,866.24/287,437.20
  6. Step 6: Final answer
    x = 164,779.20

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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.