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Finding the Fourth Proportional to 642,118.74, 886,113 and 355,632.68

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Solution

The fourth proportional to 642,118.74, 886,113 and 355,632.68 is: 490,767.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,118.74 : 886,113 = 355,632.68 : x
  2. Step 2: Convert to fraction form
    642,118.74/886,113 = 355,632.68/x
  3. Step 3: Cross multiply
    642,118.74x = 886,113 × 355,632.68
  4. Step 4: Simplify right side
    642,118.74x = 315,130,736,542.28
  5. Step 5: Solve for x
    x = 315,130,736,542.28/642,118.74
  6. Step 6: Final answer
    x = 490,767.08

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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.