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Finding the Fourth Proportional to 645,526.48, 890,813.76 and 359,040.40

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Solution

The fourth proportional to 645,526.48, 890,813.76 and 359,040.40 is: 495,468.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,526.48 : 890,813.76 = 359,040.40 : x
  2. Step 2: Convert to fraction form
    645,526.48/890,813.76 = 359,040.40/x
  3. Step 3: Cross multiply
    645,526.48x = 890,813.76 × 359,040.40
  4. Step 4: Simplify right side
    645,526.48x = 319,838,128,715.90
  5. Step 5: Solve for x
    x = 319,838,128,715.90/645,526.48
  6. Step 6: Final answer
    x = 495,468.64

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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.