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Finding the Fourth Proportional to 291,621, 402,436.98 and 157,485

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Solution

The fourth proportional to 291,621, 402,436.98 and 157,485 is: 217,329.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,621 : 402,436.98 = 157,485 : x
  2. Step 2: Convert to fraction form
    291,621/402,436.98 = 157,485/x
  3. Step 3: Cross multiply
    291,621x = 402,436.98 × 157,485
  4. Step 4: Simplify right side
    291,621x = 63,377,787,795.30
  5. Step 5: Solve for x
    x = 63,377,787,795.30/291,621
  6. Step 6: Final answer
    x = 217,329.30

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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.