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Finding the Fourth Proportional to 388,128.70, 535,588.50 and 218,330.02

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Solution

The fourth proportional to 388,128.70, 535,588.50 and 218,330.02 is: 301,279.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,128.70 : 535,588.50 = 218,330.02 : x
  2. Step 2: Convert to fraction form
    388,128.70/535,588.50 = 218,330.02/x
  3. Step 3: Cross multiply
    388,128.70x = 535,588.50 × 218,330.02
  4. Step 4: Simplify right side
    388,128.70x = 116,935,047,916.77
  5. Step 5: Solve for x
    x = 116,935,047,916.77/388,128.70
  6. Step 6: Final answer
    x = 301,279.05

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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.