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Finding the Fourth Proportional to 621,681.28, 857,918.76 and 349,749.28

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Solution

The fourth proportional to 621,681.28, 857,918.76 and 349,749.28 is: 482,653.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,681.28 : 857,918.76 = 349,749.28 : x
  2. Step 2: Convert to fraction form
    621,681.28/857,918.76 = 349,749.28/x
  3. Step 3: Cross multiply
    621,681.28x = 857,918.76 × 349,749.28
  4. Step 4: Simplify right side
    621,681.28x = 300,056,468,608.49
  5. Step 5: Solve for x
    x = 300,056,468,608.49/621,681.28
  6. Step 6: Final answer
    x = 482,653.22

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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.