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Finding the Fourth Proportional to 287,390.40, 430,870.68 and 198,389.76

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Solution

The fourth proportional to 287,390.40, 430,870.68 and 198,389.76 is: 297,436.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,390.40 : 430,870.68 = 198,389.76 : x
  2. Step 2: Convert to fraction form
    287,390.40/430,870.68 = 198,389.76/x
  3. Step 3: Cross multiply
    287,390.40x = 430,870.68 × 198,389.76
  4. Step 4: Simplify right side
    287,390.40x = 85,480,330,796.24
  5. Step 5: Solve for x
    x = 85,480,330,796.24/287,390.40
  6. Step 6: Final answer
    x = 297,436.28

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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.