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Finding the Fourth Proportional to 390,867.30, 528,085.58 and 390,867.30

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Solution

The fourth proportional to 390,867.30, 528,085.58 and 390,867.30 is: 528,085.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,867.30 : 528,085.58 = 390,867.30 : x
  2. Step 2: Convert to fraction form
    390,867.30/528,085.58 = 390,867.30/x
  3. Step 3: Cross multiply
    390,867.30x = 528,085.58 × 390,867.30
  4. Step 4: Simplify right side
    390,867.30x = 206,411,384,823.53
  5. Step 5: Solve for x
    x = 206,411,384,823.53/390,867.30
  6. Step 6: Final answer
    x = 528,085.58

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.