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Finding the Fourth Proportional to 261,312.40, 391,385.40 and 201,955.60

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Solution

The fourth proportional to 261,312.40, 391,385.40 and 201,955.60 is: 302,482.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,312.40 : 391,385.40 = 201,955.60 : x
  2. Step 2: Convert to fraction form
    261,312.40/391,385.40 = 201,955.60/x
  3. Step 3: Cross multiply
    261,312.40x = 391,385.40 × 201,955.60
  4. Step 4: Simplify right side
    261,312.40x = 79,042,473,288.24
  5. Step 5: Solve for x
    x = 79,042,473,288.24/261,312.40
  6. Step 6: Final answer
    x = 302,482.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.