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Finding the Fourth Proportional to 390,870.80, 528,090.30 and 390,870.80

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Solution

The fourth proportional to 390,870.80, 528,090.30 and 390,870.80 is: 528,090.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,870.80 : 528,090.30 = 390,870.80 : x
  2. Step 2: Convert to fraction form
    390,870.80/528,090.30 = 390,870.80/x
  3. Step 3: Cross multiply
    390,870.80x = 528,090.30 × 390,870.80
  4. Step 4: Simplify right side
    390,870.80x = 206,415,078,033.24
  5. Step 5: Solve for x
    x = 206,415,078,033.24/390,870.80
  6. Step 6: Final answer
    x = 528,090.30

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1.5x scale

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.