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Finding the Fourth Proportional to 661,555.76, 912,930.60 and 385,966.40

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Solution

The fourth proportional to 661,555.76, 912,930.60 and 385,966.40 is: 532,624.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,555.76 : 912,930.60 = 385,966.40 : x
  2. Step 2: Convert to fraction form
    661,555.76/912,930.60 = 385,966.40/x
  3. Step 3: Cross multiply
    661,555.76x = 912,930.60 × 385,966.40
  4. Step 4: Simplify right side
    661,555.76x = 352,360,537,131.84
  5. Step 5: Solve for x
    x = 352,360,537,131.84/661,555.76
  6. Step 6: Final answer
    x = 532,624.09

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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.