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Finding the Fourth Proportional to 219,307.69, 302,647.11 and 128,665.22

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Solution

The fourth proportional to 219,307.69, 302,647.11 and 128,665.22 is: 177,559.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,307.69 : 302,647.11 = 128,665.22 : x
  2. Step 2: Convert to fraction form
    219,307.69/302,647.11 = 128,665.22/x
  3. Step 3: Cross multiply
    219,307.69x = 302,647.11 × 128,665.22
  4. Step 4: Simplify right side
    219,307.69x = 38,940,156,990.51
  5. Step 5: Solve for x
    x = 38,940,156,990.51/219,307.69
  6. Step 6: Final answer
    x = 177,559.47

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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.