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Finding the Fourth Proportional to 128,605.79, 177,485.34 and 77,630.93

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Solution

The fourth proportional to 128,605.79, 177,485.34 and 77,630.93 is: 107,136.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,605.79 : 177,485.34 = 77,630.93 : x
  2. Step 2: Convert to fraction form
    128,605.79/177,485.34 = 77,630.93/x
  3. Step 3: Cross multiply
    128,605.79x = 177,485.34 × 77,630.93
  4. Step 4: Simplify right side
    128,605.79x = 13,778,351,118.14
  5. Step 5: Solve for x
    x = 13,778,351,118.14/128,605.79
  6. Step 6: Final answer
    x = 107,136.32

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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.