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Finding the Fourth Proportional to 261,990.40, 392,985.60 and 192,006.40

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Solution

The fourth proportional to 261,990.40, 392,985.60 and 192,006.40 is: 288,009.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,990.40 : 392,985.60 = 192,006.40 : x
  2. Step 2: Convert to fraction form
    261,990.40/392,985.60 = 192,006.40/x
  3. Step 3: Cross multiply
    261,990.40x = 392,985.60 × 192,006.40
  4. Step 4: Simplify right side
    261,990.40x = 75,455,750,307.84
  5. Step 5: Solve for x
    x = 75,455,750,307.84/261,990.40
  6. Step 6: Final answer
    x = 288,009.60

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1.5x scale

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.