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Finding the Fourth Proportional to 642,390.40, 886,461.71 and 355,893.40

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Solution

The fourth proportional to 642,390.40, 886,461.71 and 355,893.40 is: 491,112.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,390.40 : 886,461.71 = 355,893.40 : x
  2. Step 2: Convert to fraction form
    642,390.40/886,461.71 = 355,893.40/x
  3. Step 3: Cross multiply
    642,390.40x = 886,461.71 × 355,893.40
  4. Step 4: Simplify right side
    642,390.40x = 315,485,871,941.71
  5. Step 5: Solve for x
    x = 315,485,871,941.71/642,390.40
  6. Step 6: Final answer
    x = 491,112.37

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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.