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Finding the Fourth Proportional to 219,485.89, 302,890.42 and 128,841.86

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Solution

The fourth proportional to 219,485.89, 302,890.42 and 128,841.86 is: 177,801.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,485.89 : 302,890.42 = 128,841.86 : x
  2. Step 2: Convert to fraction form
    219,485.89/302,890.42 = 128,841.86/x
  3. Step 3: Cross multiply
    219,485.89x = 302,890.42 × 128,841.86
  4. Step 4: Simplify right side
    219,485.89x = 39,024,963,574.53
  5. Step 5: Solve for x
    x = 39,024,963,574.53/219,485.89
  6. Step 6: Final answer
    x = 177,801.70

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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.