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Finding the Fourth Proportional to 405.51, 607.64 and 260.93

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Solution

The fourth proportional to 405.51, 607.64 and 260.93 is: 390.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.51 : 607.64 = 260.93 : x
  2. Step 2: Convert to fraction form
    405.51/607.64 = 260.93/x
  3. Step 3: Cross multiply
    405.51x = 607.64 × 260.93
  4. Step 4: Simplify right side
    405.51x = 158,547.16
  5. Step 5: Solve for x
    x = 158,547.16/405.51
  6. Step 6: Final answer
    x = 390.98

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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.