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Finding the Fourth Proportional to 287,795.20, 431,692.80 and 77,454.40

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Solution

The fourth proportional to 287,795.20, 431,692.80 and 77,454.40 is: 116,181.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,795.20 : 431,692.80 = 77,454.40 : x
  2. Step 2: Convert to fraction form
    287,795.20/431,692.80 = 77,454.40/x
  3. Step 3: Cross multiply
    287,795.20x = 431,692.80 × 77,454.40
  4. Step 4: Simplify right side
    287,795.20x = 33,436,506,808.32
  5. Step 5: Solve for x
    x = 33,436,506,808.32/287,795.20
  6. Step 6: Final answer
    x = 116,181.60

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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.