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Finding the Fourth Proportional to 660,859, 912,063.20 and 392,587

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Solution

The fourth proportional to 660,859, 912,063.20 and 392,587 is: 541,816.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,859 : 912,063.20 = 392,587 : x
  2. Step 2: Convert to fraction form
    660,859/912,063.20 = 392,587/x
  3. Step 3: Cross multiply
    660,859x = 912,063.20 × 392,587
  4. Step 4: Simplify right side
    660,859x = 358,064,155,498.40
  5. Step 5: Solve for x
    x = 358,064,155,498.40/660,859
  6. Step 6: Final answer
    x = 541,816.27

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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.