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Finding the Fourth Proportional to 155,814.70, 215,041.38 and 90,417.94

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Solution

The fourth proportional to 155,814.70, 215,041.38 and 90,417.94 is: 124,786.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,814.70 : 215,041.38 = 90,417.94 : x
  2. Step 2: Convert to fraction form
    155,814.70/215,041.38 = 90,417.94/x
  3. Step 3: Cross multiply
    155,814.70x = 215,041.38 × 90,417.94
  4. Step 4: Simplify right side
    155,814.70x = 19,443,597,314.48
  5. Step 5: Solve for x
    x = 19,443,597,314.48/155,814.70
  6. Step 6: Final answer
    x = 124,786.67

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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.