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Finding the Fourth Proportional to 865,830.80, 1,300,058.40 and 666,376.40

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Solution

The fourth proportional to 865,830.80, 1,300,058.40 and 666,376.40 is: 1,000,574.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    865,830.80 : 1,300,058.40 = 666,376.40 : x
  2. Step 2: Convert to fraction form
    865,830.80/1,300,058.40 = 666,376.40/x
  3. Step 3: Cross multiply
    865,830.80x = 1,300,058.40 × 666,376.40
  4. Step 4: Simplify right side
    865,830.80x = 866,328,236,381.76
  5. Step 5: Solve for x
    x = 866,328,236,381.76/865,830.80
  6. Step 6: Final answer
    x = 1,000,574.52

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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.