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Finding the Fourth Proportional to 768,271.12, 1,060,274.16 and 428,790.40

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Solution

The fourth proportional to 768,271.12, 1,060,274.16 and 428,790.40 is: 591,764.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    768,271.12 : 1,060,274.16 = 428,790.40 : x
  2. Step 2: Convert to fraction form
    768,271.12/1,060,274.16 = 428,790.40/x
  3. Step 3: Cross multiply
    768,271.12x = 1,060,274.16 × 428,790.40
  4. Step 4: Simplify right side
    768,271.12x = 454,635,381,176.06
  5. Step 5: Solve for x
    x = 454,635,381,176.06/768,271.12
  6. Step 6: Final answer
    x = 591,764.25

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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.