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Finding the Fourth Proportional to 665,312.47, 918,130.65 and 359,388.75

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Solution

The fourth proportional to 665,312.47, 918,130.65 and 359,388.75 is: 495,956.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,312.47 : 918,130.65 = 359,388.75 : x
  2. Step 2: Convert to fraction form
    665,312.47/918,130.65 = 359,388.75/x
  3. Step 3: Cross multiply
    665,312.47x = 918,130.65 × 359,388.75
  4. Step 4: Simplify right side
    665,312.47x = 329,965,823,570.99
  5. Step 5: Solve for x
    x = 329,965,823,570.99/665,312.47
  6. Step 6: Final answer
    x = 495,956.17

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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.