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Finding the Fourth Proportional to 308,775.40, 426,117.62 and 172,808.28

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Solution

The fourth proportional to 308,775.40, 426,117.62 and 172,808.28 is: 238,479.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,775.40 : 426,117.62 = 172,808.28 : x
  2. Step 2: Convert to fraction form
    308,775.40/426,117.62 = 172,808.28/x
  3. Step 3: Cross multiply
    308,775.40x = 426,117.62 × 172,808.28
  4. Step 4: Simplify right side
    308,775.40x = 73,636,652,989.89
  5. Step 5: Solve for x
    x = 73,636,652,989.89/308,775.40
  6. Step 6: Final answer
    x = 238,479.66

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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.