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Finding the Fourth Proportional to 390,869.30, 528,088.28 and 390,869.30

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Solution

The fourth proportional to 390,869.30, 528,088.28 and 390,869.30 is: 528,088.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,869.30 : 528,088.28 = 390,869.30 : x
  2. Step 2: Convert to fraction form
    390,869.30/528,088.28 = 390,869.30/x
  3. Step 3: Cross multiply
    390,869.30x = 528,088.28 × 390,869.30
  4. Step 4: Simplify right side
    390,869.30x = 206,413,496,341.80
  5. Step 5: Solve for x
    x = 206,413,496,341.80/390,869.30
  6. Step 6: Final answer
    x = 528,088.28

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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.