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Finding the Fourth Proportional to 645,698.72, 891,050.80 and 359,212.64

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Solution

The fourth proportional to 645,698.72, 891,050.80 and 359,212.64 is: 495,705.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,698.72 : 891,050.80 = 359,212.64 : x
  2. Step 2: Convert to fraction form
    645,698.72/891,050.80 = 359,212.64/x
  3. Step 3: Cross multiply
    645,698.72x = 891,050.80 × 359,212.64
  4. Step 4: Simplify right side
    645,698.72x = 320,076,710,242.11
  5. Step 5: Solve for x
    x = 320,076,710,242.11/645,698.72
  6. Step 6: Final answer
    x = 495,705.97

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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.