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Finding the Fourth Proportional to 423,530.81, 635,161.49 and 139,155.81

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Solution

The fourth proportional to 423,530.81, 635,161.49 and 139,155.81 is: 208,689.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,530.81 : 635,161.49 = 139,155.81 : x
  2. Step 2: Convert to fraction form
    423,530.81/635,161.49 = 139,155.81/x
  3. Step 3: Cross multiply
    423,530.81x = 635,161.49 × 139,155.81
  4. Step 4: Simplify right side
    423,530.81x = 88,386,411,621.76
  5. Step 5: Solve for x
    x = 88,386,411,621.76/423,530.81
  6. Step 6: Final answer
    x = 208,689.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.