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Finding the Fourth Proportional to 131,485.34, 181,486.95 and 77,789.12

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Solution

The fourth proportional to 131,485.34, 181,486.95 and 77,789.12 is: 107,370.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,485.34 : 181,486.95 = 77,789.12 : x
  2. Step 2: Convert to fraction form
    131,485.34/181,486.95 = 77,789.12/x
  3. Step 3: Cross multiply
    131,485.34x = 181,486.95 × 77,789.12
  4. Step 4: Simplify right side
    131,485.34x = 14,117,710,131.98
  5. Step 5: Solve for x
    x = 14,117,710,131.98/131,485.34
  6. Step 6: Final answer
    x = 107,370.98

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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.