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Finding the Fourth Proportional to 528,007.40, 790,628.70 and 387,002.60

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Solution

The fourth proportional to 528,007.40, 790,628.70 and 387,002.60 is: 579,490.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,007.40 : 790,628.70 = 387,002.60 : x
  2. Step 2: Convert to fraction form
    528,007.40/790,628.70 = 387,002.60/x
  3. Step 3: Cross multiply
    528,007.40x = 790,628.70 × 387,002.60
  4. Step 4: Simplify right side
    528,007.40x = 305,975,362,534.62
  5. Step 5: Solve for x
    x = 305,975,362,534.62/528,007.40
  6. Step 6: Final answer
    x = 579,490.67

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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.