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Finding the Fourth Proportional to 878,693.16, 1,212,854.34 and 511,256.76

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Solution

The fourth proportional to 878,693.16, 1,212,854.34 and 511,256.76 is: 705,684.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    878,693.16 : 1,212,854.34 = 511,256.76 : x
  2. Step 2: Convert to fraction form
    878,693.16/1,212,854.34 = 511,256.76/x
  3. Step 3: Cross multiply
    878,693.16x = 1,212,854.34 × 511,256.76
  4. Step 4: Simplify right side
    878,693.16x = 620,079,980,220.34
  5. Step 5: Solve for x
    x = 620,079,980,220.34/878,693.16
  6. Step 6: Final answer
    x = 705,684.31

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Double scale
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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.