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Finding the Fourth Proportional to 666,424.16, 918,708.80 and 475,105.40

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Solution

The fourth proportional to 666,424.16, 918,708.80 and 475,105.40 is: 654,963.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,424.16 : 918,708.80 = 475,105.40 : x
  2. Step 2: Convert to fraction form
    666,424.16/918,708.80 = 475,105.40/x
  3. Step 3: Cross multiply
    666,424.16x = 918,708.80 × 475,105.40
  4. Step 4: Simplify right side
    666,424.16x = 436,483,504,938.45
  5. Step 5: Solve for x
    x = 436,483,504,938.45/666,424.16
  6. Step 6: Final answer
    x = 654,963.51

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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.