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Finding the Fourth Proportional to 631,685.64, 871,728.46 and 345,205.76

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Solution

The fourth proportional to 631,685.64, 871,728.46 and 345,205.76 is: 476,385.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    631,685.64 : 871,728.46 = 345,205.76 : x
  2. Step 2: Convert to fraction form
    631,685.64/871,728.46 = 345,205.76/x
  3. Step 3: Cross multiply
    631,685.64x = 871,728.46 × 345,205.76
  4. Step 4: Simplify right side
    631,685.64x = 300,925,685,547.93
  5. Step 5: Solve for x
    x = 300,925,685,547.93/631,685.64
  6. Step 6: Final answer
    x = 476,385.19

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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.