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Finding the Fourth Proportional to 660,863, 912,068.70 and 392,591

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Solution

The fourth proportional to 660,863, 912,068.70 and 392,591 is: 541,821.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,863 : 912,068.70 = 392,591 : x
  2. Step 2: Convert to fraction form
    660,863/912,068.70 = 392,591/x
  3. Step 3: Cross multiply
    660,863x = 912,068.70 × 392,591
  4. Step 4: Simplify right side
    660,863x = 358,069,963,001.70
  5. Step 5: Solve for x
    x = 358,069,963,001.70/660,863
  6. Step 6: Final answer
    x = 541,821.77

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1.5x scale

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.