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Finding the Fourth Proportional to 672,657.55, 928,289.78 and 400,688.31

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Solution

The fourth proportional to 672,657.55, 928,289.78 and 400,688.31 is: 552,963.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    672,657.55 : 928,289.78 = 400,688.31 : x
  2. Step 2: Convert to fraction form
    672,657.55/928,289.78 = 400,688.31/x
  3. Step 3: Cross multiply
    672,657.55x = 928,289.78 × 400,688.31
  4. Step 4: Simplify right side
    672,657.55x = 371,954,863,138.47
  5. Step 5: Solve for x
    x = 371,954,863,138.47/672,657.55
  6. Step 6: Final answer
    x = 552,963.19

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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.