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Finding the Fourth Proportional to 76,804.34, 105,979.53 and 42,808.79

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Solution

The fourth proportional to 76,804.34, 105,979.53 and 42,808.79 is: 59,070.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,804.34 : 105,979.53 = 42,808.79 : x
  2. Step 2: Convert to fraction form
    76,804.34/105,979.53 = 42,808.79/x
  3. Step 3: Cross multiply
    76,804.34x = 105,979.53 × 42,808.79
  4. Step 4: Simplify right side
    76,804.34x = 4,536,855,444.07
  5. Step 5: Solve for x
    x = 4,536,855,444.07/76,804.34
  6. Step 6: Final answer
    x = 59,070.30

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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.