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Finding the Fourth Proportional to 665,820.89, 918,215.21 and 423,851.21

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Solution

The fourth proportional to 665,820.89, 918,215.21 and 423,851.21 is: 584,521.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,820.89 : 918,215.21 = 423,851.21 : x
  2. Step 2: Convert to fraction form
    665,820.89/918,215.21 = 423,851.21/x
  3. Step 3: Cross multiply
    665,820.89x = 918,215.21 × 423,851.21
  4. Step 4: Simplify right side
    665,820.89x = 389,186,623,207.83
  5. Step 5: Solve for x
    x = 389,186,623,207.83/665,820.89
  6. Step 6: Final answer
    x = 584,521.50

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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.