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Finding the Fourth Proportional to 308,840.21, 426,206.70 and 172,870.77

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Solution

The fourth proportional to 308,840.21, 426,206.70 and 172,870.77 is: 238,565.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,840.21 : 426,206.70 = 172,870.77 : x
  2. Step 2: Convert to fraction form
    308,840.21/426,206.70 = 172,870.77/x
  3. Step 3: Cross multiply
    308,840.21x = 426,206.70 × 172,870.77
  4. Step 4: Simplify right side
    308,840.21x = 73,678,680,408.16
  5. Step 5: Solve for x
    x = 73,678,680,408.16/308,840.21
  6. Step 6: Final answer
    x = 238,565.70

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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.