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Finding the Fourth Proportional to 315,445.82, 435,315.93 and 172,205.90

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Solution

The fourth proportional to 315,445.82, 435,315.93 and 172,205.90 is: 237,644.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,445.82 : 435,315.93 = 172,205.90 : x
  2. Step 2: Convert to fraction form
    315,445.82/435,315.93 = 172,205.90/x
  3. Step 3: Cross multiply
    315,445.82x = 435,315.93 × 172,205.90
  4. Step 4: Simplify right side
    315,445.82x = 74,963,971,509.99
  5. Step 5: Solve for x
    x = 74,963,971,509.99/315,445.82
  6. Step 6: Final answer
    x = 237,644.52

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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.